Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX2 array.

A220243

Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX2 array.

Terms

    a(0) =1a(1) =5a(2) =18a(3) =37a(4) =85a(5) =184a(6) =393a(7) =826a(8) =1726a(9) =3568a(10) =7342a(11) =15009a(12) =30562a(13) =62034a(14) =125493a(15) =253311a(16) =510438a(17) =1026775a(18) =2063029a(19) =4141268a(20) =8305979a(21) =16649028a(22) =33356608a(23) =66803160a(24) =133746856a(25) =267712961a(26) =535761706a(27) =1072043156a(28) =2144889675a(29) =4291005857

External references